I changed my Apple ID and password old email still shows as user name

Hello SusieAnnQue2,

Welcome to Apple Support Communities. 

We understand that you have changed your Apple ID and want to sign in with your new Apple ID on your Apple devices. We are happy to help.

We recommend these steps to change your Apple ID: Change your Apple ID - Apple Support

"How to change your Apple ID to a different email address

1. Go to appleid.apple.com and sign in.
2. In the Sign-In and Security section, choose Apple ID.
3. Enter the email address that you want to use as your Apple ID.
4. Choose Change Apple ID.
5. If you changed your Apple ID to a third-party email address, check your email for a verification code, then enter the code. Learn what to do if you didn't get the email.
6. If you use services like iCloud or Messages to share with friends and colleagues, sign in to those services with your updated Apple ID.

If you can't change your Apple ID

If you try to change your Apple ID to an @icloud.com email address that was created within the last 30 days, you will be asked to try again later.

If you see a message that the email address you want to use isn't available or is already in use, check that you or a family member aren't already using that email address with a different Apple ID. If a family member is using that email address, remove it from their account then try to use it. 

In some countries or regions, you can use your phone number as your Apple ID. But if your Apple ID is an email address, you can't change it to a phone number."

Please try the steps here as they may help: What to do after you change your Apple ID or password - Apple Support

"FaceTime

Update your Apple ID and password on your iPhone, iPad, iPod touch, and Mac.

iPhone, iPad, and iPod touch

Go to Settings > FaceTime.

• If you're signed out on your iPhone or iPod touch, tap "Use your Apple ID for FaceTime" and enter your updated Apple ID and password. On your iPad, just enter your updated Apple ID and password.
• If you're signed in with your previous Apple ID, tap your Apple ID, then tap Sign Out. On your iPhone or iPod touch, tap "Use your Apple ID for FaceTime" and enter your updated Apple ID and password to sign in. On your iPad, just enter your updated Apple ID and password.

iCloud

Update your Apple ID and password on your iPhone, iPad, iPod touch, Mac, PC, and Apple TV.

iPhone, iPad, and iPod touch

If you’re using iOS 10.3 or later, go to Settings > [your name]. If you’re using iOS 10.2 or earlier, go to Settings > iCloud

• If you're signed out, enter your updated Apple ID and password. The data in iCloud will automatically appear on your device after you sign in.
• If you're still signed in with your previous Apple ID:

1. Scroll down and tap Sign Out, then follow the onscreen steps. You might need to enter your password. Your data will remain in iCloud and will be updated on your device when you sign in to iCloud again.
2. Enter your updated Apple ID and password. 

If you updated your Apple ID email address* before signing out of iCloud, and your device repeatedly asks for the password to your previous Apple ID, you can temporarily change your Apple ID to sign in.

App Store, Books Store, and iTunes Store

Update your Apple ID and password on your iPhone, iPad, iPod touch, Mac, Apple TV, or Windows PC. On a Mac with macOS Mojave or earlier, iTunes includes iTunes Genius, iTunes Home Sharing, iTunes Match, and iTunes Store. On a Mac with macOS Catalina, open Apple Music, Apple TV, or Apple Podcasts instead of iTunes.

iPhone, iPad, and iPod touch

If you’re using iOS 10.3 or later, go to Settings > [your name] > iTunes & App Store. If you’re using iOS 10.2 or earlier, go to Settings > iTunes & App Store.

• If you're signed out, enter your updated Apple ID and password.
• If you're signed in with your previous Apple ID, tap your Apple ID, then tap Sign Out. Then enter your updated Apple ID and password.

Messages

After you update your Apple ID, your friends will receive new messages from your updated Apple ID. Old messages aren't removed.

iPhone, iPad, and iPod touch

Go to Settings > Messages, then tap Send & Receive.

• If you're signed out on your iPhone or iPod touch, tap "Use your Apple ID for iMessage" then enter your updated Apple ID and password. On your iPad, just enter your updated Apple ID or password.
• If you're signed in with your previous Apple ID, tap your Apple ID, then tap Sign Out. On your iPhone or iPod touch, tap "Use your Apple ID for iMessage" and enter your updated Apple ID or password. On your iPad, just enter your updated Apple ID and password."

Let us know if you have further questions.

Take care.